GooglePhoto设置壁纸----壁纸裁剪界面配置

背景描述：

Google photo打开一张图片，点击设为、弹出提示框里选择photo，提示“发生错误，无法加载媒体”。

error,could not load media

问题分析

1、对比机同样操作，可以打开壁纸应用设置壁纸

2、其它对比机，打开Google photo自己的编辑图片界面，点击可以正常设置壁纸。

Log分析

1.  
   Google相册里点击设为：
2.  
   START u0 \{act=android.intent.action.CHOOSER flg=0x1 cmp=android/com.android.internal.app.ChooserActivity clip=\{image/jpeg \{...}} (has extras)} from uid 10211
3.  
    
4.  
   弹出选择框后点击相册：
5.  
   START u0 \{act=android.intent.action.ATTACH_DATA dat=content://com.谷歌.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/50/ORIGINAL/JPG/image/jpeg/380847275 typ=image/jpeg flg=0x3000001 cmp=com.谷歌.android.apps.photos/.setwallpaper.SetWallpaperActivity (has extras)} from uid 10211
6.  
    
7.  
   START u0 \{act=android.service.wallpaper.CROP_AND_SET_WALLPAPER dat=content://com.谷歌.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/50/ORIGINAL/JPG/image/jpeg/380847275 flg=0x1 pkg=com.谷歌.android.apps.wallpaper cmp=com.谷歌.android.apps.wallpaper/com.android.wallpaper.picker.StandalonePreviewActivity} from uid 10211
8.  
    
9.  
   ActivityManager: Start proc 3437:com.谷歌.android.apps.wallpaper/u0a241 for pre-top-activity \{com.谷歌.android.apps.wallpaper/com.android.wallpaper.picker.StandalonePreviewActivity}

        以上为Google pixel机器的log，如log显示，最终打开了com.谷歌.android.apps.wallpaper Google自己的壁纸应用。

1、选择器界面为系统界面：android/com.android.internal.app.ChooserActivity

2、选择相册之后，可以看到一个action，裁剪并且设置壁纸 android.service.wallpaper.CROP_AND_SET_WALLPAPER可以看出是根据action和包类名去启动的界面

3.1、熟悉原生壁纸代码的话，可以很快意识到这个action是用来启动壁纸裁剪界面的

1.  
   <activity android:name="com.android.wallpaper.picker.StandalonePreviewActivity"
2.  
   android:resizeableActivity="false"
3.  
   android:theme="@style/WallpaperTheme.Preview">
4.  
   <intent-filter>
5.  
   <action android:name="android.service.wallpaper.CROP_AND_SET_WALLPAPER" />
6.  
   <category android:name="android.intent.category.DEFAULT" />
7.  
   <data android:mimeType="image/*" />
8.  
   </intent-filter>
9.  
   </activity>

3.2、设置壁纸的action

1.  
   <activity android:name="com.android.wallpaper.picker.TopLevelPickerActivity"
2.  
   android:label="@string/app_name"
3.  
   android:theme="@style/WallpaperTheme.NoBackground"
4.  
   android:resizeableActivity="false">
5.  
   <intent-filter>
6.  
   <action android:name="android.intent.action.SET_WALLPAPER"/>
7.  
   <category android:name="android.intent.category.DEFAULT"/>
8.  
   </intent-filter>
9.  
   </activity>

3.3、附加数据的action

1.  
   Used to indicate that some piece of data should be attached to some other place. For example, image data could be attached to a contact. It is up to the recipient to decide where the data should be attached; the intent does not specify the ultimate destination.
2.  
   Input: getData is URI of data to be attached.
3.  
   Output: nothing
4.  
   @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
5.  
   public static final String ACTION_ATTACH_DATA = "android.intent.action.ATTACH_DATA";

4、framework/base下面搜索CROP_AND_SET_WALLPAPER找到相关逻辑代码

frameworks/base/core/java/android/app/WallpaperManager.java

1.  
   /**
2.  
   * Gets an Intent that will launch an activity that crops the given
3.  
   * image and sets the device's wallpaper. If there is a default HOME activity
4.  
   * that supports cropping wallpapers, it will be preferred as the default.
5.  
   * Use this method instead of directly creating a {@link #ACTION_CROP_AND_SET_WALLPAPER}
6.  
   * intent.
7.  
   *
8.  
   * @param imageUri The image URI that will be set in the intent. The must be a content
9.  
   * URI and its provider must resolve its type to "image/*"
10.  
    *
11.  
    * @throws IllegalArgumentException if the URI is not a content URI or its MIME type is
12.  
    * not "image/*"
13.  
    */
14.  
    public Intent getCropAndSetWallpaperIntent(Uri imageUri) {
15.  
    if (imageUri == null) {
16.  
    throw new IllegalArgumentException("Image URI must not be null");
17.  
    }
18.  
     
19.  
    if (!ContentResolver.SCHEME_CONTENT.equals(imageUri.getScheme())) {
20.  
    throw new IllegalArgumentException("Image URI must be of the "
21.  
    ContentResolver.SCHEME_CONTENT " scheme type");
22.  
    }
23.  
     
24.  
    final PackageManager packageManager = mContext.getPackageManager();
25.  
    Intent cropAndSetWallpaperIntent =
26.  
    new Intent(ACTION_CROP_AND_SET_WALLPAPER, imageUri);
27.  
    Log.d(TAG, "imageUri 111 : " imageUri);
28.  
    cropAndSetWallpaperIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
29.  
     
30.  
    // Find out if the default HOME activity supports CROP_AND_SET_WALLPAPER
31.  
    Intent homeIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME);
32.  
    ResolveInfo resolvedHome = packageManager.resolveActivity(homeIntent,
33.  
    PackageManager.MATCH_DEFAULT_ONLY);
34.  
    if (resolvedHome != null) {
35.  
    cropAndSetWallpaperIntent.setPackage(resolvedHome.activityInfo.packageName);
36.  
     
37.  
    List<ResolveInfo> cropAppList = packageManager.queryIntentActivities(
38.  
    cropAndSetWallpaperIntent, 0);
39.  
    if (cropAppList.size() > 0) {
40.  
    Log.w(TAG, "cropAndSetWallpaperIntent 111 : " cropAndSetWallpaperIntent);
41.  
    return cropAndSetWallpaperIntent;
42.  
    }
43.  
    }
44.  
     
45.  
    // fallback crop activity
46.  
    final String cropperPackage = mContext.getString(
47.  
    com.android.internal.R.string.config_wallpaperCropperPackage);
48.  
    cropAndSetWallpaperIntent.setPackage(cropperPackage);
49.  
    List<ResolveInfo> cropAppList = packageManager.queryIntentActivities(
50.  
    cropAndSetWallpaperIntent, 0);
51.  
    if (cropAppList.size() > 0) {
52.  
    Log.w(TAG, "cropAndSetWallpaperIntent 222 : " cropAndSetWallpaperIntent);
53.  
    return cropAndSetWallpaperIntent;
54.  
    }
55.  
    // If the URI is not of the right type, or for some reason the system wallpaper
56.  
    // cropper doesn't exist, return null
57.  
    throw new IllegalArgumentException("Cannot use passed URI to set wallpaper; "
58.  
    "check that the type returned by ContentProvider matches image/*");
59.  
    }

原生的逻辑还是比较清晰的，

        1、先看看homeIntent能否匹配到这个action（也就是看看launcher是否注册了这个action）

        2、然后判断默认配置config_wallpaperCropperPackage的包名对应的应用是否有注册这个action（我们希望它走这里正常打开我们自己的壁纸界面，配置自己的壁纸应用包名即可）

        3、如果都没有，最后Google photo会打开自己的壁纸编辑界面

5、配置路径和其它壁纸相关的配置

frameworks/base/core/res/res/values/config.xml

1.  
   <!-- Component name of the built in wallpaper used to display bitmap wallpapers. This must not be null. -->
2.  
   <string name="image_wallpaper_component" translatable="false">com.android.systemui/com.android.systemui.ImageWallpaper</string>
3.  
    
4.  
   <!-- Class name of WallpaperManagerService. -->
5.  
   <string name="config_wallpaperManagerServiceName" translatable="false">com.android.server.wallpaper.WallpaperManagerService</string>
6.  
    
7.  
   <!-- If AOD can show an ambient version of the wallpaper -->
8.  
   <bool name="config_dozeSupportsAodWallpaper">true</bool>
9.  
    
10.  
    <!-- Wallpaper cropper package. Used as the default cropper if the active launcher doesn't
11.  
    handle wallpaper cropping.
12.  
    -->
13.  
    <string name="config_wallpaperCropperPackage" translatable="false">com.android.wallpaperpicker</string>
14.  
     
15.  
    <!-- The max scale for the wallpaper when it's zoomed in -->
16.  
    <item name="config_wallpaperMaxScale" format="float" type="dimen">1.10</item>

6、如果是mtk平台，会有覆盖路径

device/mediatek/common/overlay/wallpaper/frameworks/base/core/res/res/values/config.xml

device/mediatek/system/common/overlay/wallpaper/frameworks/base/core/res/res/values/config.xml

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